A storage medium is provided having a relatively large number of relatively small servo sectors. The storage medium includes a plurality of tracks. Each track includes a plurality of data sectors and a plurality of servo sectors. Each servo sector includes a plurality of servo marks and a synchronization gap. A plurality of first servo sectors includes a synchronization gap having a first length and a plurality of second servo sectors includes a synchronization gap having a second length. The first length is different from the second length, whereby, an unsynchronized reading device may recognize the longer synchronization gap and synchronize to the servo sector and a synchronized reading device may remain synchronized by recognizing the shorter synchronization gap.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A storage medium having a plurality of tracks, the storage medium comprising: a plurality of data sectors on each track; and a plurality of servo sectors on each track, the number of servo sectors per track being greater than 200 servo sectors per track; each servo sector comprising a plurality of servo marks; and each servo sector having a gap, the gap having no servo marks, the length of gap being less than 7 servo clock cycles.
2. The storage medium of claim 1 wherein the number of servo sectors is greater than 1000 servo sectors per track.
3. The storage medium of claim 1 wherein the number of servo sectors is greater than 2000 servo sectors per track.
4. The storage medium of claim 1 wherein the length of the gap is less than 4 servo clock cycles.
5. A disk drive for reading data from a storage medium having a plurality of tracks divided into a plurality of zones, each track having a track number encoded into the track the disk drive comprising a read head for reading data along a track and the track number of each track, the disk drive comprising: a phase lock loop frequency generator that generates a first frequency derived from locking a servo signal from the storage medium; a multiplying phase locked loop that multiplies the first frequency by a variable to derive a second frequency for use in reading data marks, the variable based upon the track number read by the disk drive; and a reading device that uses the first frequency to read servo marks and the second frequency to read data marks.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
August 30, 2001
March 28, 2006
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